* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
    color: #fff;
    font-size: 24px;
}

header {
    position: fixed;
    width: 100%;
    height: 100px;
    background-color: #000;
}

header>a {
    /* display: block; */
    float: left;
}

header nav {
    float: right;
    margin-right: 45px;
}

header nav>a {
    float: left;
    line-height: 100px;
    margin-left: 65px;
}
section > img{
    vertical-align: middle;
    width: 100%;
    border: none;
}
section > img:nth-child(1){
    margin-top: 100px;
}

footer{
    width: 100%;
    height: 100px;
    background-color: #000;
    line-height: 100px;
    text-align: center;
}
footer > a {
    margin-left: 50px;
}